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Product loadability Problematic choice of suitable relay contact for a particular load switched with a product is described below. Mostly we experience problems with incorrect choice of load (meaning incorrect relay for a particular load) which results in permanent switching of contact (sealing) or damage on relay contact – which then results in malfunction. What load can you use? Detailed types of load according to standard EN 60947 are described in charts below – categories of use. Category of use AC current, cosφ = P/S (-) AC-1 Typical use Non-inductive or slightly inductive load, resistance furnace Includes all appliances supplied by AC current with power factor (cos .) 0,95. Examples of use: resistance furnace, industrial loads AC-2 AC-3 EN Motors with slip-ring armature, switching off Motors with short-circuit armature, motor switching when in operation This category applies to switching off motors with short-circuit armature while in operation. While switching, contactor switches current which is 5 up to 7 times rated current of motor. AC-4 AC-5a AC-5b Electro-motors with short-circuit armature: start up, braking by backset, changeover Switching of electrical gas-filled lights, fluorescent lights El. bulb switching AC-6a AC-6b AC-7a AC-7b AC-8a Switching of transformers Switching of capacitors Switching low inductive loads of home appliances and similar applications Load of motors for home appliances Switching of hermetically sealed motors of cooling compressors with manual reset switches against overload AC-8b Switching of hermetically sealed motors of cooling compressors with manual reset switches against overload 60947-4 60947 60947-4 60947 60947-4 60947-4 Enables low contact loading due to resistance of cold fiber is many times smaller that the one of hot fiber. 60947-4 60947-4 60947 60947 60947 Hermetically sealed cooling compressors have to be placed in one box without external shaft or shaft padding and motor must operate with cooling liquid 60947 Hermetically sealed cooling compressors have to be placed in one box without external shaft or shaft padding and motor must operate with cooling liquid AC-12 AC-13 AC-14 AC-15 Switching of semiconductor loads with separation transformers Switching of semiconductor loads with separation transformers Switching of low electro-magnetic loads (max.72 VA) Management of alternating electro-magnetic loads This category applies to switching inductive loads with input for closed electro-magnetic circuit higher than 72 VA Use: switching coils of contactors AC-20 AC-21 AC-22 AC-23 AC-53a TECHNICAL INFORMATION DC current, t = L/R (s) DC-1 DC-3 DC-5 DC-6 DC-12 DC-13 DC-14 DC-20a(b) DC-21a(b) DC-22a(b) DC-23 Connecting and disconnecting in unloaded states Switching resistive loads, including low loading Switching of mixed resistive and inductive loads, including low overloading Switching of motor loads or other high inductive loads Switching of motors with short-circuit armature with semiconductor contactors Note: Category AC 15 replaces formerly used category AC 11 Non-inductive or low inductive load, resistive furnaces Shunt motors: start-up, braking by backset, reversion, resistive braking Series motor: start-up, braking by backset, reversion, resistive braking Non-inductive or low inductive loads, resistive furnaces – el. bulbs Management of resistive loads and fixed loads with insulation by opto-electric element Switching of electromagnets Switching of electromagnetic loads in circuits with limiting resistor Switching and breaking without load(a: frequent switching ,b: occasional switching) Switching ohmic loads including limiting overloading (a: frequent switching ,b: occasional switching) Switching of highly inductive loads (e.g. series motors) 60947-5 60947-5-1 60947-5-1 60947-5 60947-3 60947-3 60947-3 60947-3 60947 60947-4 60947-4-1 60947-4-1 60947-4-1 60947-5-1 60947-5-1 60947-5-1 60947-3 60947-3 60947-3 60947-3 How can you distinguish for which load is our product (relay) designated? Our company record this information on a products and also in our catalogue, instruction manual and other promotional and technical material (web-site etc.). It is important to realize that it is not always possible to point out load because of lack of information about the device ( user cannot measure cos .) or it is not possible because of inconstancy of parameters of switched device. Manufacturer of relays record always guaranteed parameters in ideal conditions which are done by a norm (temperature, pressure, humidity, etc.) and reality can be in a lot of cases different. Category of use (classification) of a particular relay is done by material of output contacts. Basic types of materials which are used for production of contacts for high-performance relay are: a)AgCd – suitable for switching ohmic loads. Before of harmfulness of Cd, this type of contact is remitted. b)AgNi –designated for switching resistive loads , good quality switching and conducting (contact doesn’t oxidate) small currents/voltages ,it is not designated for surge currents and loads with inductive component c)AgSn or AgSnO –suitable for switching loads with inductive component , not suitable for switching small currents/voltages, it is more resistive to surge currents, suitable for DC voltage switching, less suitable for switching loads of ohmic type d)Wf (wolfram)-special contact designated for switching surge currents with inductive component e)with gold (AgNi/Au)- it is used for “improving” contacts for low currents/ voltages , prevents oxidation. 96 Product loadability LOAD RELAY CONTACT 16 A AC5a AC5a AC5a AC5a AC1 AC3 AC15 DC1 (24/110/220 V) 1000 W 1000 W 750 W 500 W 4000 VA 0.9 kW 750 VA 16 A/0.5 A/0.35 A AC15 DC1 (30/110/220 V) × 125 VA 10 A/0.49 A/0.33 A 10 AC5b 2000 W AgSnO2 It is valid for foolowing products: CRM-4, CRM-42, SHT-1, SHT-1/2, SHT-3, SOU-1, MR-41, MR-42, VS116K, VS316, VS116U, VS316/24, VS316/230, TER-3, SMR-B LOAD RELAY CONTACT 8A 10 AC5b AgNi AC5a AC5a AC5a AC5a × × × × 500 W AC1 AC3 2500 VA It is valid for foolowing products: CRM-61, SOU-2, HRN-54, HRN-54N, HRN-55, HRN-55N, HRN-56, HRN-57, HRN-57N PRI-32, PRI-51, TER-9 LOAD RELAY CONTACT 16 A AC5a AC5a AC5a AC5a AC1 AC3 AC15 DC1 (24/110/220 V) × × × × 4000 VA 0.9 kW 750 VA 16 A/0.5 A/0.35 A 10 AC5b AgNi 1000 W It is valid for foolowing products: CRM-81J, CRM-91H, PRM-91H, CRM-91HE, CRM-2HE, CRM-2H, CRM-2T, PDR-2/A, PDR-2/B, SJR-2, HRH-2, HRN-33, HRN-34, HRN-35, HRN-37, HRN-41, HRN-42, HRN-43, HRN-43N, HRN-63, HRN-64, HRN-67, PRI-41, PRI-42, HRH-1, COS-1, TER-4, TEV-1, TEV-2, TEV-3, Thermo LOAD RELAY CONTACT 8A AC5b AgNi AC5a AC5a AC5a AC5a AC1 AC3 AC15 DC1 (24/110/220 V) × × × × 2000 VA × 375 VA 8 A/0.4 A/0.25 A AC1 AC3 AC15 DC1 (24/110/220 V) 1250 VA × 0.75 A/ 240 V 5 A/0.5 A/0.3 A 500 W 10 It is valid for foolowing products: CRM-83J, CRM-93H, PRM-92H, PRM-2H, CRM-82TO, VS308K, VS308U, TER-7 LOAD RELAY CONTACT 3A 10 AC5b AgNi AC5a AC5a AC5a AC5a × × × × 500 W It is valid for foolowing products: CRM-2T/480 MINIMUM LOAD RELAY CONTACT AgSnO2 LOAD MINIMUM LOAD mW V / mA 1000 10/100 LAMP, HALOGEN LIGHT LOW-VOLTAGE EL.BULBS 12-24V WOUND TRANSFORMERS RESISTIVE R INDUCTIVE L RELAY CONTACT AgNi LOW-VOLTAGE EL.BULBS 12-24V UNCOMPENSATED FLUORESCENT LAMPS ELECTRONIC TRANSFORMERS EKONOMIC FLUORESCENT LAMPS mW V / mA 300 5/10 SWITCHING MANAGEMENT SWITCHING MANAGEMENT CAPACITIVE C ACCORDING TO BALLAST ACCORDING TO BALLAST INCLINE EDGE DESCENDING EDGE SMR-T × × × × × SMR-H × × × × × SMR-B × × × TYPE OF LOAD SYMBOLS COMMENTS 97 AC5b lamp, halogen light AC5a uncompensated fluorescent lamps AC5a compensated fluorescent lamps in series 10 AC5a AC5a R, L, C AC-1 compensated fluorescent lamps in parallel ekonomic fluorescent lamps Dimmer with defi ned load: R - resistive L - inductive C - capacitive Non-inductive or low-inductive loads, resistive furnance AC-3 Squirrel-cage motors, switching of motors in operation AC-15 Controlling of alternative electro-magnetic loads DC-1 Non-inductive or low-inductive loads, resistive furnances TECHNICAL INFORMATION (symbols)